Glock 43 if you’re carrying Glock 17 home defense
^^^^^THIS, but a G19 for home defense is fine too.
I will add though, that a Canik TP9 SF and the TP9 SC are every bit as equal to Glocks in reliability with much better triggers, for about $100 less
Though everybody should have at least 1 Glock in case of BIG IGLOO, magazines and parts are plentiful